20
13 19 20 11 14 16 17 12 18 15 
16 15 13 12 19 20 14 11 18 17 
17 20 15 11 18 14 12 16 19 13 
15 19 18 20 12 14 16 17 13 11 
14 18 16 19 17 20 13 15 12 11 
18 15 17 14 19 20 11 16 13 12 
18 17 14 15 11 12 16 20 13 19 
14 16 15 20 17 11 12 18 13 19 
11 17 12 13 20 16 18 14 15 19 
13 18 12 11 14 19 17 20 16 15 
8 1 9 4 6 7 3 10 2 5 
2 6 9 8 7 3 4 5 1 10 
9 6 8 7 1 10 3 2 4 5 
3 6 2 9 10 7 4 5 1 8 
9 2 5 4 1 6 10 7 8 3 
3 7 2 9 10 8 6 4 1 5 
3 5 1 8 6 2 7 10 9 4 
8 5 10 1 9 6 2 3 7 4 
10 8 2 4 3 7 1 5 9 6 
9 2 6 5 7 3 1 4 8 10 
forbidden 1 17
forbidden 2 14
forbidden 2 16
forbidden 2 17
forbidden 2 18
forbidden 2 19
forbidden 2 20
forbidden 3 13
forbidden 3 17
forbidden 3 18
forbidden 4 11
forbidden 4 14
forbidden 4 16
forbidden 4 17
forbidden 4 20
forbidden 5 12
forbidden 5 14
forbidden 6 12
forbidden 6 19
forbidden 7 12
forbidden 7 14
forbidden 7 15
forbidden 7 16
forbidden 7 17
forbidden 8 14
forbidden 8 17
forbidden 8 18
forbidden 8 19
forbidden 9 12
forbidden 9 14
forbidden 9 16
forbidden 9 17
forbidden 10 11
forbidden 10 12
forbidden 10 15
forbidden 10 16
forbidden 10 18